.lctx is a texture format that is utilized in the game Tornado Outbreak. The format is a derivative of the Microsoft DirectDraw Surface (DDS) format.
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The string “LCTX” appears after the first 14 bytes, serving as a signature for the file. The next five bytes store the original texture name and its extension that were used before the conversion to the .lctx format began. The remainder of the file contains the base texture data followed by its mipmaps.